linux-kernel - [PATCH v13 1/6] MIPS: Loongson64: dts: update the display controller device node

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Date:   Sun, 27 Mar 2022 22:40:16 +0800
From:   Sui Jingfeng <15330273260@....cn>
To:     Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Roland Scheidegger <sroland@...are.com>,
        Zack Rusin <zackr@...are.com>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Sam Ravnborg <sam@...nborg.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Qing Zhang <zhangqing@...ngson.cn>,
        suijingfeng <suijingfeng@...ngson.cn>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH v13 1/6] MIPS: Loongson64: dts: update the display controller device node

The display controller is a pci device, it is used in ls2k1000 SoC and
LS7A1000 bridge. Its PCI vendor id is 0x0014, its PCI device id is 0x7a06.
In order to let the driver to know which chip the DC is contained in,
the compatible of the display controller is named according to the chip's
name.

For LS7A1000, there are 4 dedicated GPIOs whose control register is
located at the DC register space. They are used to emulate i2c for reading
edid from the monitor. One for DVO0, another for DVO1.

LS2K1000 and LS2K0500 SoC don't have such GPIOs, they grab i2c adapter
from other module, either general purpose GPIO emulated i2c or hardware
i2c adapter.

This patch add common part of the DC device node only, it does not contain
ports device note. As it is for the generic, boards only with transparent
encoders should works simply by inherit from this.

Signed-off-by: Sui Jingfeng <15330273260@....cn>
---
 .../boot/dts/loongson/loongson64-2k1000.dtsi  |  8 +++++++
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi     | 24 +++++++++++++++----
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
index 8143a61111e3..2ecb5a232f22 100644
--- a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
+++ b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
@@ -198,6 +198,14 @@ sata@8,0 {
 				interrupt-parent = <&liointc0>;
 			};
 
+			lsdc: display-controller@6,0 {
+				compatible = "loongson,ls2k1000-dc";
+
+				reg = <0x3000 0x0 0x0 0x0 0x0>;
+				interrupts = <28 IRQ_TYPE_LEVEL_LOW>;
+				interrupt-parent = <&liointc0>;
+			};
+
 			pci_bridge@9,0 {
 				compatible = "pci0014,7a19.0",
 						   "pci0014,7a19",
diff --git a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
index 2f45fce2cdc4..1d3fe73b31d5 100644
--- a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
+++ b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
@@ -160,15 +160,29 @@ gpu@6,0 {
 				interrupt-parent = <&pic>;
 			};
 
-			dc@6,1 {
-				compatible = "pci0014,7a06.0",
-						   "pci0014,7a06",
-						   "pciclass030000",
-						   "pciclass0300";
+			lsdc: display-controller@6,1 {
+				compatible = "loongson,ls7a1000-dc";
 
 				reg = <0x3100 0x0 0x0 0x0 0x0>;
 				interrupts = <28 IRQ_TYPE_LEVEL_HIGH>;
 				interrupt-parent = <&pic>;
+
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				i2c6: i2c@6 {
+					compatible = "loongson,gpio-i2c";
+					loongson,sda = <0>;
+					loongson,scl = <1>;
+					loongson,nr = <6>;
+				};
+
+				i2c7: i2c@7 {
+					compatible = "loongson,gpio-i2c";
+					loongson,sda = <2>;
+					loongson,scl = <3>;
+					loongson,nr = <7>;
+				};
 			};
 
 			hda@7,0 {
-- 
2.25.1